Wow, interesting I wasn't expecting it to potentially be related to arrows... I do not know what the arrow spine is for the arrows I am shooting.... I am shooting some carbon steel arrows I bought from a conventional archery store, Gold Tip - Lightning, and I can't find information on the spine for these arrows.
The bow is tillered at about 22# or so, and my partner is right handed, left hadn't holding the bow and right handed drawing the string back.